migrations的音标：...

n.迁移，移居( migration的名词复数 )...

It foundered during the turmoils accompanying the Great Migrations.它在随着民族大迁徙而出现的混乱中崩溃.They are sexually mature at this age and begin to participate in the breeding migrations.在这个时候它们性征发育成熟并开始参与繁殖大迁徙.This old so - called ...